4. share the video: use the share button from the top-right corner and click Facebook, Twitter or Google+.

5. read the video's description: click the "i" button from the top-right corner.

6. subscribe to the video's channel: click the "i" button from the top-right corner and then click the "subscribe" button.

7. find the number of views: click the "i" button from the top-right corner.

8. add the video to the "watch later" playlist: click the "clock" button next to the YouTube logo.

9. turn off annotations: click the conversation icon at the bottom.

10. enable captions: click the "CC" button. To disable them, click the same button and then "turn captions off".

11. move captions: use drag&drop to change their position.

12. change caption size: use + or - keyboard shortcuts. You can also change the caption's foreground/background colors and the font: click the "CC" button and pick "caption settings". Click "background" to enable the caption background (there's also a keyboard shortcut: b). Your settings are saved and YouTube will used them for other videos.